I hate most of these things too

1. mouth noises (chewing with mouth open, popping gum, gross swallowingnoises, ill-fitting teeth noises, the "ahhh" after a refreshing drink,whistling, etc).

2. someone standing at a transaction counter (misc store, food counter,etc) for way too long after they've finished their transaction,apparently unaware that anyone else exists in the world and might bestanding behind them waiting to pay for their item.

3. slow, zig-zaging walkers.

4. loud talkers in public places.

5. people having to explain why they asked you a question, after youalready told them that you don't know the answer. Does it matter???